package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.mapper.UserMapper;
import com.sky.utils.HttpClientUtil;
import com.sky.vo.UserLoginVO;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.HashMap;
import java.util.Map;
import java.util.Objects;

/**
* @author MrWang
* @description 针对表【user(用户信息)】的数据库操作Service实现
* @createDate 2023-10-23 16:18:48
*/
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User>
    implements UserService{

    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WeChatProperties weChatProperties;

    //微信服务接口地址
    public static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";

    /**
     * 微信登录
     * @param userLoginDTO
     * @return
     */
    @Transactional
    @Override
    public User login(UserLoginDTO userLoginDTO) {
        //调用微信接口服务，获得当前微信用户的openid
        String openid = getOpenId(userLoginDTO.getCode());
        //判断openid是否为空，如果为空表示登录失败，抛出业务异常
        if (openid == null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
        //判断当前用户是否为新用户,如果是新用户，自动完成注册
        LambdaQueryWrapper<User> queryWrapper = new LambdaQueryWrapper<User>()
                .eq(User::getOpenid,openid);
        User user = userMapper.selectOne(queryWrapper);
        if (Objects.isNull(user)){
            user = new User();
            user.setOpenid(openid);
            userMapper.insert(user);//添加完后自动给user的id赋值
        }
        //返回用户对象
        return user;
    }

    private String getOpenId(String code){
        //调用微信接口服务，获得当前微信用户的openid
        Map<String,String> map = new HashMap<>();
        map.put("appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code",code);
        map.put("grant_type","authorization_code");
        String json = HttpClientUtil.doGet(WX_LOGIN, map);

        JSONObject jsonObject = JSON.parseObject(json);
        String openid = jsonObject.getString("openid");
        return openid;
    }
}




